How do psychiatrists evaluate whether mood symptoms meet criteria for bipolar disorder?

Psychiatrists evaluate bipolar disorder through a comprehensive psychiatric assessment that includes a detailed mood history, identification of manic or hypomanic episodes using DSM-5-TR criteria, and differential diagnosis to rule out other conditions. Diagnosis requires at least one manic episode for bipolar I or one hypomanic plus one depressive episode for bipolar II, with symptoms that cause functional impairment.

Bipolar Disorder Evaluation: How Psychiatrists Assess Mood

Published: 2026-07-22

bipolar disorder mood assessment DSM-5-TR

Quick answer: Full psychiatric assessment with mood history, DSM-5-TR criteria for manic or hypomanic episodes, and differential diagnosis to exclude other causes.

Bipolar disorder is frequently missed or misdiagnosed. People with bipolar II disorder often seek help only for depressive episodes, and hypomanic episodes may go unnoticed. Misdiagnosis can happen because symptoms overlap with other conditions like schizophrenia, personality disorders, and thyroid disease. If subtle signs are missed and an initial depressive episode is treated with antidepressants alone, a manic episode or rapid cycling may be triggered. A structured evaluation process is essential.

Step 1: Full Psychiatric Assessment

When evaluating suspected bipolar disorder, psychiatrists begin with a comprehensive psychiatric assessment. According to NICE guidance, this includes documenting a detailed history of mood, episodes of overactivity and disinhibition or other episodic and sustained changes in behaviour, symptoms between episodes, triggers to previous episodes and patterns of relapse, and family history.

Additional assessment areas include:

The development and changing nature of the mood disorder throughout the person's life (early childhood trauma, developmental disorders, cognitive dysfunction)
Social and personal functioning and current psychosocial stressors
Potential mental and physical comorbidities
Physical health, reviewing medication and side effects including weight gain
Treatment history, identifying interventions that have been effective or ineffective in the past

Psychiatrists should encourage people to invite a family member or carer to give a corroborative history. Collateral information helps identify past hypomanic or manic episodes the patient may not recognize.

Step 2: Apply DSM-5-TR Criteria for Manic and Hypomanic Episodes

The diagnosis rests on identifying specific mood episodes using DSM-5-TR criteria. Criterion A for manic and hypomanic episodes emphasizes changes in activity and energy as well as mood, not just mood alone.

Manic episode (required for bipolar I):

Abnormally and persistently elevated, expansive, or irritable mood plus increased activity or energy lasting at least 1 week (or less if hospitalization is necessary)
Three or more additional symptoms (or 4 if mood is only irritable): inflated self-esteem or grandiosity, decreased need for sleep, more talkative than usual, flight of ideas, distractibility, psychomotor agitation, excessive involvement in risky activities
The mood disturbance must result in severe impairment, include psychotic features, or result in hospitalization
Not caused by substance use or another medical condition

Hypomanic episode (required for bipolar II):

Distinct period of elevated, expansive, or irritable mood plus increased activity or energy lasting at least 4 days
Three or more additional symptoms from the same list as mania
Changes are observable by others but do not cause marked impairment, psychotic features, or hospitalization

Major depressive episode (required for bipolar II):

Five or more symptoms during the same 2-week period, with at least one being depressed mood or loss of interest or pleasure
Symptoms present nearly every day (except suicidal thoughts or attempts)

Step 3: Determine Bipolar I vs Bipolar II

The distinction between bipolar I and bipolar II depends on the type of mood episodes identified:

Bipolar I: Requires at least one manic episode. May have been preceded or followed by hypomanic or major depressive episodes. The manic episode must not be better explained by schizoaffective disorder and is not superimposed on schizophrenia or other psychotic disorders.
Bipolar II: Requires at least one hypomanic episode and at least one major depressive episode. Hypomanic episodes differ from manic episodes because they do not involve psychotic features, marked impairment in function, or the need for hospitalization.

A depressive episode with mixed features (at least 3 manic/hypomanic symptoms present during the depression) is a significant risk factor for the development of bipolar I or bipolar II disorder.

Step 4: Consider Specifiers

DSM-5-TR includes specifiers that clarify the type and severity of the current episode. Important specifiers include:

Mixed features: At least 3 depressive symptoms present during a manic/hypomanic episode, or at least 3 manic/hypomanic symptoms present during a major depressive episode. This specifier replaced the DSM-IV mixed episode, which required simultaneously meeting full criteria for both mania and depression. Individuals rarely meet full criteria for both episode types at the same time.
With anxious distress: Rates the severity of anxious distress in individuals with bipolar or depressive disorders, relevant to prognosis and treatment decisions.
Psychotic features: Presence of hallucinations or delusions during mood episodes.
Remission status: Full or partial remission.

Patients with mixed features may show poor response to lithium and may become less stable when taking antidepressants. Accurate application of specifiers helps tailor treatment decisions.

Step 5: Differential Diagnosis

Psychiatrists must consider alternative explanations for mood symptoms. According to NICE CKS, differential diagnoses include:

Unipolar depression: Bipolar disorder rather than unipolar depression may be suggested by early-onset depression (younger than 25 years old) or a strong family history. However, a diagnosis of bipolar disorder should never be made on these grounds alone.
Cyclothymia: Chronic disturbance of mood with periods of depression and hypomania, where depressive symptoms do not meet criteria for a depressive episode.
Schizophrenia: Mania, delusions, and hallucinations in the absence of prominent mood symptoms suggest schizophrenia. It is important to consider the course of the disorder over past days and weeks, rather than focusing solely on current symptoms.
Underlying medical conditions: Stroke, thyroid disease, multiple sclerosis. Some health conditions such as thyroid disease can cause symptoms like those of bipolar disorder.
Substance use: Effects of prescribed, recreational, or illicit drugs can mimic or worsen mood symptoms.
Personality disorders: Borderline or histrionic personality disorder. Suspect if mood changes are rapid and do not occur in cycles.
ADHD (in children and adolescents): Clear-cut episodes of elated mood, grandiosity, and cycles of mood help distinguish bipolar disorder from ADHD, conduct disorder, and schizophrenia.

Step 6: Rule Out Medical and Substance-Induced Causes

Diagnosis is based on clinical criteria, but stimulant use disorder and general medical disorders such as pheochromocytoma must be ruled out by examination and testing. A physical exam and medical testing help rule out other illnesses. Thyroid function testing is particularly important since thyroid disease can present with mood symptoms resembling bipolar disorder.

Red Flags Requiring Escalation

Current or recent manic episode with psychotic features requiring hospitalization
Suicidal ideation or recent suicide attempts
Severe functional impairment during mood episodes
Rapid cycling pattern (4 or more episodes in 12 months)
Depressive episode with mixed features, signalling risk of bipolar spectrum
Substance use that may trigger or worsen mood episodes
History of antidepressant-induced mania or hypomania

Common Questions

Can bipolar disorder be diagnosed during a single visit?

No. Diagnosis requires assessing the lifetime course of symptoms, including identifying past manic or hypomanic episodes that the patient may not recognize. Collateral history from family or carers is often essential. Many people have bipolar disorder for years before diagnosis because hypomanic episodes go unnoticed.

What is the difference between bipolar I and bipolar II?

Bipolar I requires at least one full manic episode (severe impairment, hospitalization, or psychotic features). Bipolar II requires at least one hypomanic episode (observable change but no severe impairment or hospitalization) plus at least one major depressive episode. Hypomanic episodes are less severe than manic episodes in bipolar I. Many people with bipolar II spend extended periods in a persistent, low-grade depressive state.

Why is differential diagnosis so important?

Several conditions can mimic bipolar disorder. Misdiagnosis leads to inappropriate treatment. Treating bipolar depression with antidepressants alone can trigger manic episodes or rapid cycling. Thyroid disease, substance use, and personality disorders all require different management approaches.

Protocol Summary

How Rovetia Helps

Rovetia helps psychiatrists centralize longitudinal mood histories across multiple visits. The platform structures clinical notes, collateral histories from family members, episode timelines, and medication responses into a searchable patient record. AI-assisted documentation reduces administrative burden, while the per-patient timeline makes it easier to track episodic patterns, identify triggers for relapse, and compare treatment responses over time.

Sources: Clinical guidance from the Merck Manual Professional Edition on bipolar disorders, APA DSM-5-TR diagnostic criteria for bipolar I and bipolar II disorders, and NICE CKS guidance on bipolar disorder differential diagnosis.